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This does indicate some uncertainty, but there are also other indications that show this card's positive potential, especially in the Breya, Etherium Shaper lists

Improbable Alliance Improbable Alliance was my introduction to the power of some of these whenever you draw your second card payoffs

"Flying Elephant": If this card avoids destruction by an opponent's card effect with its own effect, then inflicts battle damage to your opponent by a direct attack next turn, you win the Duel

The restriction to CMC four or less is completely reasonable, and is tempered by the fact it can hit any nonland permanent, including Planeswalkers

These all provide some incidental value before winning, but most importantly, they dont require you to engage in combat

While many cards with cumulative upkeep have seen some play, this is one instance where an entire decks win condition is built around the mechanic and its ever-growing pressure to maintain payment